The flight of insects is not easy. A very large energy is spent in beating of wings. But these animals are so fantastic that they can make only some parts of the body are heated to save energy is so important for life! Wow finally, one that's Flying.
The strange structures you can see are called corematas. They're used to spread large amounts of pheromones which attract females. The size of these scent organs are dependent on the diet that the moth experienced as a caterpillar.